How to get the cause of high CPU usage by DPC / Interrupt
Posted 17 May 2010 - 12:37 PM
I'm hoping that you could help me with my laptop issues. Firstly my CPU runs at aprx. 55% when nothing strainuous is being done, aslo when it is running at that % after a while my connection to my network becomes unidentified and the only way to get reconnected to the network is by restarting my laptop. I've tried disabling then re-enabling the ethernet controller in device manager but it doesn't help. I believe that the two problems are connected as I have never been disconnected from the network while the cpu % usage is normal.
I have gone through the steps that you gave us for identifying the cause of the high CPU usage and from the graph, ACPI.sys has the highest counts.
I don't know very much about computers and how to read the graph so could you please help me in this regard.
This is my 1st forum post too so I'm not too sure how to upload an image, do I click on insert image and drag the image into the box there?
Thanks for your time and will appreciate any help I can get.
Posted 18 May 2010 - 05:42 AM
Posted 18 May 2010 - 12:26 PM
Okay...it's been a day or two and it seems that by doing the above, it has resolved my issue. Two days with out interrupts. Not 100% positve that it will fix you guys problem, but it seems to have worked for me. Good luck.
Posted 20 May 2010 - 08:02 AM
My CPU was being dominated and one of my cores stayed maxed out ALL the time. Through your tutorial, I found Bonjour to be the culprit. I did not uninstall, but just deactivated at start-up. When I rebooted my Pavilion dv6000 laptop both cores were running consistently between 0-14% when idle - wonderful!! Prior to uninstalling Bonjour, I read another post explaining that Microsoft Security Essentials did not run well with other anti-virus programs. I began using Norton 360 and there may have been some conflicts there. I'm not sure which of these gave the biggest improvement, but I am thankful that you took the time to give these very handy step-by-step instructions.
Thanks again - Jim
Posted 23 May 2010 - 04:58 PM
A screenshot of my Interrupt CPU Usage Summary Table is attached. Any help would be appreciated. Thanks in advance.
Number of downloads: 29
This post has been edited by htrieu: 23 May 2010 - 05:13 PM
Posted 25 May 2010 - 12:37 PM
Posted 27 May 2010 - 03:06 AM
sorry, this is not the result you should get. I've never seen this message before.
Have you installed the x64 version of the WPT?
sry for the late respons , yes i installed the x64 version of WPT but anyway i unistalled the x64 version of win7 and installed win7 x86 version , and i have the same high (100%) cpu , ill try ur tutorial when i get back from work . hope i wont have any problems . ill post later today
Posted 27 May 2010 - 09:50 PM
I have all drivers updated with Driver genius professional to the newest, but not helped. Also BIOS is updated to latest...
Acer Aspire 8935G
:: Processor - Intel Core 2 Quad Q9000 2 GHz
:: Memory - 4096 MB, DDR3
:: Graphics adapter - ATI Mobility Radeon HD 4670 - 1024 MB, Core: 675 MHz, Memory: 800 MHz, DDR3
:: Harddisk - TOSHIBA MK5055GSX, 320GB 5400rpm
WIN 7 PRO x86
thanks in advance
This post has been edited by neotyp: 27 May 2010 - 09:54 PM
Posted 28 May 2010 - 06:33 AM
Posted 29 May 2010 - 10:43 AM
I also have massive DPC latency issues (spikes >60.000us in DPC Latency Checker), but it doesn't come with high CPU usage at all! If I analyse the .etl file of Win Perf Analyser, the Interrupt and DPC CPU usage is just around 0,5% See the attached screens.
When I restart my PC the latency problem is away for 5 minutes or so and then gets worse by the minute. It slows down almost any application (Windows runs like I have a 1Ghz Celeron) and seriously distorts sound playback esp. in video files. System is almost unworkable.
Any idea what could be causing this? Hardware failure maybe? Or a driver problem?
I will upload the .etl file to SkyDrive asp.
Asus P5Q, Intel Core2Duo Q6600, 3GB DDR2 1066Mhz, ATI Radeon 4870, Win 7 x64
This post has been edited by davidov2009: 29 May 2010 - 10:46 AM
Posted 29 May 2010 - 11:16 AM
on mousemove the sound was distorted and the system was extremely slow. I am very unpleased with this notebook/windows
This notebook was distributed with Win Vista Home but I have reinstalled it on the 1st day, probably I will try install Vista and will see if the problems will continue
Posted 30 May 2010 - 03:47 AM
your etl file hast 49000 lost events.
The sdbus.sys is causing the DPC issue. Are you using the latest drivers for your SD card reader (SDA Standard Compliant SD Host Controller)? What is the vendor of this device?
For the interrupts, the driver is again unknown.
upload the file please.